Proverbs 4:23cNew King James Version

23 Keep your heart with all diligence,

For out of it spring the issues of life.

Mark 7:6-7 New King James Version

6 He answered and said to them, “Well did Isaiah prophesy of you hypocrites, as it is written:

‘This people honors Me with their lips,

But their heart is far from Me.

7 And in vain they worship Me,

Teaching as doctrines the commandments of men.’

Mark 7:20-23 New King James Version

20 And He said, “What comes out of a man, that defiles a man. 21 For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, 22 thefts,covetousness, wickedness, deceit, lewdness, an evil eye,blasphemy, pride, foolishness. 23 All these evil things come from within and defile a man.”